Tool for dressing grinding-wheels



F. E. KOEBEL TOOL FORDRESSING GRINDING WHEELS Jul 7, 1936.

Filed Sept. 6, 1955 'Invehtoh A o y-v,

Patented July 7, i936 UNITED STATES TOOL FOR DRESSING GRINDlNG-WHEELSFrank E; Koebel, Glen Ridge, N. J., assignor to J. K. Smit & Sons, Inc.,New York. N. Y., a corporation of New York Application September 2Claims.

This invention relates to a dressing tool carrying a diamond for truingthe grinding wheels of various types of grinding machines. The object ofthe invention is to provide a free flow of cooling water supplyimmediately around the cutting point of the diamond and in the head inwhich, the diamond is set and the diamond base will also be cooled sothat the life of the diamond will be .extended by preventing'it frombecoming overheated during the wheel dressing or truing operation.Another object is to accomplish this with a water supply which ismounted independently of the'tool so that the tool will be free foradjustments, removal and interchange with other tools. Another object isto effect this cooling of both the point and the back of the diamondseparately to each place by water which has not been used in cooling theother place. This makes it possible to utilize the water supply withwhich grinding machines" are usually provided for their regular grindingoperations.

In the accompanying sheet of drawings which forms a part of thisdescription,

Figure 1 shows in elevation a tool for dress- 25 ing grinding-wheelsaccording to this invention with its head carrying a diamond partly insection, together with a portion of a wheel to be dressed and a nozzlefrom which cooling water is supplied.

Fig. 2 is an end view of the head.

- Fig. 3 is a section through the head on the line IIIIII of Fig. l.

Fig. 4 is a modified form partly in section.

Fig. 5 is a section through V-V of Fig. 4.

The tool as shown in Figs. 1,- 2, and 3 consists of a bar l preferablyof round bar steel. At its end is ahead H in the end of which a diamondof tool with its head 35 the head on the line 40 I2 is firmly set. Fourtransverse holes or passageways 13 are drilled from the periphery of thehead inclined to the axis of the bar so as to pass close to the diamondand meet behind the cup or cavity in which the diamond is set. Theentrances to these holes are as close to the end.

of the'head as convenient and have beveled countersinks to afford funnelwater inlets to whichever entrances are on the upper side. Additional 50holes or passageways I4 are drilled from the end of the head close tothe cup and meet the transverse holes. Water also circulates throughthese to cool further the part of the diamond that is embedded in thehead. The circulation through the holes above the diamond will be fromthe end of the head to the transverse holes and in the holes below thediamond the circulatinn will be in the opposite direction..

6, 1935, Serial No. 39,370

In the modification shown in Figs. 4- and 5, with a head I6 for adifferently shaped diamond ll there are three intersecting transverseholes 18 perpendicular to the axis and crossing at the back of thediamond.

It will be. seen from the two forms that the number, size and locationof the holes will depend on the size and shape of the cup or cavityrequired to hold the diamond, the requirements being to provide as muchcooling surface as possible close to the diamond setting and leavesufiicient metal for the rigid support of the diamond and connectionwith the bar.

' The tool when it is to be used is preferably mounted on a slide notshown so that it can be fed across the face. of the grinding wheel 2!]and take a cut of from one to three one-thousandths -of an inch witheach revolution of the wheel. While the truing is in progress, water isdischarged from a nozzle 2i. A fender 22 keeps the water from spatteringbackfrom where it is required. The stream is directed against thecutting point of the diamond and a portion is diverted and finds its wayto the inlets to the pas-' sageways which adjoin the diamond setting.

It will be seen that the water which courses through the passageways andtherefore has its temperature raised is not subsequently used to coolthe diamond point, and also that the water which cools the point of thediamond is not subsequently used to cool the setting. Since the nozzlefrom which the water is discharged has no direct physical connectionwith the -tool, the machinist is in no way hampered inadjusting theposition of the tool to present the cutting point of the diamond to itswork to the best advantage, or in changing tools.

I claim,

1. A tool for dressing grinding-wheels comprising a diamond, and a headwith the diamond set therein having passageways contiguous to thediamond with inlets and outlets the inlets being in the peripherythereof and positioned to receive a portion of a stream of cooling waterdirected against the diamond.

2. A mechanism for dressing grinding-wheels for a grinding machinehaving in combination a tool comprising a diamond, a head with thediamond set therein having passageways contiguous to the diamond withinlets and outlets, the inlets being in the periphery thereof andpositioned to receive a portion of a stream of cool- ,ing water when it.is directed against the diamond, and a nozzle independent of directconnection with the tool for directing the water stream.

FRANK E. KOEBEL.

